7、ace 五、动词过去式(共3题;共10分)17.(4分)动词过去式变化watch________meet________ run________walk________18.(3分)把下列动词改成它的过去式have________buy________ drop________19.(3分)动词不规则变化go________ come________第9页共9页do________六、选词填空(共2题;共10分)20.(5分)选词填空when what where who whose ① ________did